Hi, I decided to step up from renting equipment and finally buy some of my own. I've been researching and have narrowed my options for boards down to three, but I can't decide which will be best for me and would appreciate some advice. I'm 5'5'' and 133 lbs. The rental company gave me boards based on height so I always thought I was a 145 but through research I've discovered my weight should be the larger determinent. I'm probably still considered a beginner but I'm picking up fast and I want a board that will grow with me so I don't have to repurchase as soon as I'm bored with my board.

Based on research, I've narrowed the boards down to the K2 Lunatique, the Ride Compact, and the Rome Vinyl. I'm leaning towards the Ride Compact because it's a twin and I like to ride switch as much as regular but I'm not sure if I wouldn't prefer more than just a low rize rocker to avoid catching edges, particularly since I'm still new (also, the Compact has poor reviews on ice.)

Also, I'm confused by the difference between what the rental company gave me and what the spec sizes say on the board websites. According to Ride Compact, because I'm more than 125 lbs, I should ride a 150. The Vinyl sets me at 151, and I unfortunately can't find size specs for K2 Lunatique. That seems large; I would have guessed a 147 for myself per general size charts I'm finding but I wonder of the weight of the particular boards I'm looking at is why I'm hitting larger than 147.

Of the three, which is a better all-mountain snowboard for a 5'5", 133 lb girl still learning but advancing? And is a 150/151 insane or just right? I measured and this brings the board up to my nose.

Also, what is the best rear-entry binding? I've looked at Roxy Rock-Its, GNU B-Trues, and various Flows. Roxys seems to have the highest rating in reviews so far.

Any and all advice is very much appreciated, even up to recommending a better board or bindings!

Of the 3 you picked probably the Vinyl would be the best all mountain that you can progress with. The compact is a park deck i think and the k2 is a beginner board i think. I would probably try to get it in a rocker and not camber though. This will make it easier to learn/progress on since it will be stiffer then the rental boards.

For size, a 150 isn't crazy for your weight but you could drop as low as a 147 and be ok. I know girls that are around your weight who ride any where from a 147 to 152 for all meowntain.

Ride baretta might be a good choice since it has some setback and a rockered nose. Unless you really want a true twin, which you generally only need if you are riding a large percentage switch, other wise some set back is nice.

Thank you, everyone; I really appreciate the advice! After reading the above, I definitely realized I should lean towards a Rome and once I looked at the specs I decided that the Rome Romp is the best fit for me. Thank you!

For what it's worth, my wife started on a K2 Luna (the predecessor to the Lunatique). It was fully cambered, and medium stiffness. She loved the board for the first two years, and now has gone up to a longer mostly cambered board (with an early rise nose) and has become an excellent snowboarder...

I'm probably still considered a beginner but I'm picking up fast and I want a board that will grow with me so I don't have to repurchase as soon as I'm bored with my board.
...
And is a 150/151 insane or just right? I measured and this brings the board up to my nose.

Can't help you with the board selection, as I know none of your list, just some general thoughts:

If you want to go for the shorter or bigger option, depends on you preferences, how fast you'll progress and in which direction. A 147 will certainly do in your early stage and will have the advantage of being easier to maneuver.

If you think you'll become a freeride type of rider, will enjoy carving n riding pretty fast, a 147 will soon become too short; not enough edge to work with, chattery at speed. How soon you'd then wish to size up depends on how fast you'll progress.
I once had a pretty stiff 149 men's board which I appreciated for being easy to turn and it for sure helped me to progress to a certain point, but I replaced it after a season cos it was just too chattery for this type of riding.

If you think you're more of a playfull rider, cruising over the mtn, not overly into speed, the 147 could go a long way.

For what it's worth, my wife started on a K2 Luna (the predecessor to the Lunatique). It was fully cambered, and medium stiffness. She loved the board for the first two years, and now has gone up to a longer mostly cambered board (with an early rise nose) and has become an excellent snowboarder...

Never write off camber!

The camber vs. rocker thing is kind of a religious discussion... but I'm in pouts boat. It can't be wrong to learn to mind ones edges. Maybe not as noob, but at some point while progressing, everyone should have had a camber board. To overcome the "catching edges" phase should be a step in the progression and not be just avoided by gear. My opinion.